Re: [Haskell-cafe] Data.Map: Values to keys and keys to values

Why not make it unlossy and have: trans :: (Ord k, Ord a) => Map k a -> Map a (Set k) On Thu, Jun 16, 2011 at 9:10 AM, Johan Tibell wrote:

On Thu, Jun 16, 2011 at 3:01 PM, Dmitri O.Kondratiev wrote:

...

Hi, Data.Map has many great functions, yet I could not find the one that allows from one map create another map where keys are values and values are keys of the first one. Something like: transMap:: (Ord k, Ord a) => Map k a -> Map a k

Does such function exist?

Note that such a function would be lossy as there might be duplicate values in the map.

Cheers, Johan

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